Erytromycin oxime and 9-amino-3-o-clandinosyl - 5 - o - desosaminyl - 6,11,12 - trihydroxy - 2,4,6,8,10,12 - hexamethyl - pentadecane-olide



United States Patent i 3,418,014

Patented Nov. 11, 1969 7 3,478,014 olide, while both compounds still retain their antibiotic ERYTROMYCIN OXIME AND 9-AMINO-3-0-CLAN- acflvlty- DINOSYL 0 E A L 6,11,12 RI- According to this lnvention, the oxirnation of erythro- HYDROXY 2,4,6,8,10,12 HEXAMETHYL PEN- mycin is carried out by the action of hydroxylamine, TADECANE-OLIDE which is being set free by reaction of its salts, such as Slobodan Dj okic and Zrinka Tamburasov, Zagreb, Y gq- 5 hydroxylamine hydrochloride, with alkaline reagents, Slavla,a8lgll0l'$ t0 PLIVA, Pharmaceutical and Chem! e.g. barium carbonate, in an inert anhydrous organic cal Works Zagreb Yugoslav! a corporation of solvent, e.g. methanol, with the exclusion of moisture,

131? lilillting. Filed Aug. 16 1967 Ser.No. 660,895 at PH of i 7 and at elevated lemPerature- The Int Cl. C07c 47/18; i 21/00 erythrornycin oxime prepared is converted by means of CL 2 0 0 4 Claims reducing agents, such as sodium borohydride, to 9-amino- 3 O cladinosyl 5 O desosaminyl 6,11,12 trihydroxy 2,4,6,8,10,12 hexamethylpentadecane 13 olide,

ABSTRACT OF THE DISCLOSURE while the other part of the erythromycin molecule remains unchanged. 1

The present invention relates to the preparation of 9 amino 3 O cladinosyl 5 O desosaminyl 6 erythromycin mom: and 9-am1no-3-O-clad1nosyl-5-O- desosaminyl 6,11,12 trihydroxy 2,4,6,8,10,12 hexa- 4 3 f hexfnflethylpemadec' methy1pemadecane 13 o1ide erythromycylamine there ane-13-ol1 de 1s character1zed by 1ts dipicrate prepared from, which are new antibiotic compounds. from sodium p crate and an amlne in methanol hydro- 2O chloric acid solution, and by its dihydrochloride prepared from a methanol solution of hydrochloric acid.

Th novel compounds of tha invention can b Iepre- Determination of antibiotic activity of erythromycin t d by th f l oxime and 9-amino-3-O-cladinosyl-5-O-desosarninyl-6,11,

6 OH (|)H r r IfiIOH (3H orrar r 1131 1 113 I CH CHJ-i'J-$?CfiJCH -?-C?fiJ-$--C=O II CHaH CH3 H OH A) H O H /CH (CH3)2N- O O OCH: CH3 CH3 H OH on 1 1 NH, (3H ([IH; 1 1 (3H H CfiHa oH60HgO-b--o--J--t J--o-OHroo-o+-o =0 H CH: H CHaH H OH O H O H OH I OH; (CH3)2N- o 0 l OCHIS CH3 H2 0H These new compounds are useful by virtue of their un- 12 trihydroxy 2,4,6,8,10,12 hexamethylpentadecaneexpectedly high Stability in an acid medium even at P 13-olide on Bacillus subtilis and Bacillus mycoides has 2 and/or their use as intermediates for the preparation h A r o h r of new compounds wlth antlbacten a1 tactlvlty. s wn that t e oxime possesses an activity of 500 550 Erythromycin is an antibiotic of the macrolyde type, and the amine one 460400 having the following structural formula: The stability of these compounds at pH 2 illustrates H cm H CH3 H OH H H CH CH3 OH By reduction thereof, dihydroerythromycin is prepared, the unexpected advantages compared with that of erythroin which the keto group in position 9 of the aglycone part mycin itself: of molecule has been converted into a hydroxyl group. A dihydroerythromycin is biologically inactive, it is sup- Activity after hour posed that the keto group is one of the decisive factors 0 1 3 6 conferrlng antibiotic action upon erythromycin. Er thm i u T 0 0 According to the presentinvention, the carbonyl group Erthw$ifi'o t$'aiiai; wigs) 837 89 in position 9 of erythromycin can be oximated, and there- Erythwmycylamme, 330 292 after the oxime obtained converted by reduction to 9- amino 3 O cladinosyl 5 O desosaminyl 6,11,12- The remarkable elfect of an oximino and an amino trihydroxy 2,4,6,8,10,12 hexamethyl pentadecane 13- group is clear from the table.

The following examples, in which erythromycin oxime and 9 amino 3 O-cladinosyl-S-O-desosaminyl-6,11,12- tn'hydroxy 2,4,6,8,10,12 hexamethylpentadecane 13- olide :are produced by the process according to the invention, are given by way of illustration:

EXAMPLE 1 Erythromycin oxime 30 g. of erythromycin were dissolved in 150 ml. of water-free methanol, 14.7 g. of hydroxylamine hydrochloride and 21.0 g. of barium carbonate were then added and the mixture was refluxed for 22 hours with the exclusion of moisture. The suspension obtained was filtered and the precipitate on the filter was washed with hot methanol. The methanol filtrates were combined and evaporated in vacuo to /3 of the original volume. After cooling, the resultant colourless crystalline product was filtered olf, washed with ether and dried at room temperature in vacuo. The yield: 14.5 g. (48.3%) of erythromycin oxime; M.P.: 176186 C. After recrystallisation from absolute methanol, the product had M.P.: 184-189 C. (decomposition); a =-73.5 (C=1% in methanol). Activity on Bacillus subtilis and Bacillus mycoides: 500- 550 u./mg.

Analysis-Calculated for C H N O 748.930; N, 3.73%. Obtained: N, 3.41%.

4 (70%). Activity on Bacillus subtilis and Bacillus mycoides: 460-500 u./mg.

Analysis.Calculated for C37H70N2O12: 734.946; N, 3.81%. Obtained: N, 4.02%.

EXAMPLE 3 9-amino 3 O cladinosyl-S-O-desosaminyl-6,l1,12- trihydroxy 2,4,6-,8,l0,12 hexamethylpentadecane 13- olide dipicrate was prepared from the amine and sodium picrate in a methanol solution of hydrochloric acid; M.P.: 185 -187 C.

Analysis.-Calculated for C49Hq N 02 N, 9.43%. Obtained: N, 9.63%.

EXAMPLE 4 2. 9 amino 3 O cladinosyl 5 O desosaminyl- 6,11,12 trihydroxy 2,4,6,8,10,12 hexamethylpentadecane-13-olide of the formula:

5 on on H NH: CH3 OH; 1? CH3 H on. CII OHi(fC-(|3+- 2-oH2o-o-o-h-oo=o HHaH CHalilI H OHOLII OH I CH3 s)2 O 0 00H. H3 H3 OH EXAMPLE 2 5 3. 9-amino 3 O cladinosyl 5 O desosaminyl- 9-amino 3 O cladinosyl 5 O desosaminyl-6,11,12- trihydroxy 2,4,6,8,10,12 hexamethylpentadecane-l3- olide To a solution of 3.0 g. of sodium borohydride in ml. of water-free methanol, a solution of 10.0 g. of erythromycin oxime in 30 ml. of water-free methanol was added drop by drop with stirring and cooling for 3 hours. The temperature of the reaction mixture was not allowed to exceed 10 C. Then the reaction mixture was left for two days at room temperature, whereafter dry carbon dioxide gas was introduced. The precipitate formed was filtered off and the filtrate evaporated to dryness in vacuo at room temperature. The residue was dissolved in 100 ml. of chloroform and the solution was washed three times with 25 ml. portions of 10% aqueous sodium bicarbonate solution and twice with 25 ml. portions of water. The chloroform extract was then dried over sodium sulphate, filtered and evaporated to dryness in vacuo. The resultant crude 9-amino-3-O-cladinosyl-5- O desosaminyl 6,11,12 trihydroxy-2,4,6,8,10,12-hexamethylpentadecane-13-olide was recrystallised from an ether and petroleum ether mixture: M.P.: 142147 C.; a (C=1% in methanol). The yield: 7 g.

UNITED STATES PATENTS 2,870,138 1/1959 Murray. 2,894,943 7/1959 Nelson et a1. 3,125,569 3/1964 Martin et al. 3,198,833 8/1965 Beregi et al. 3,294,842 12/ 1966 Swanson.

LEWIS GOTTS, Primary Examiner J. R. BROWN, Assistant Examiner US. Cl. X.R. 260-999 mg U1\ ITED STATES PATENT OFI ICE CERTIFICATE OF CORRECTION Patent No. '7 a Dated November 11, 9 9

Inventor(s) Slobodan DJokic and Zrinka Tamburasov It is certified that error appears in the above-identified patent and that said Letters Patent are hereby corrected as shown below:

Column 1, in the title, "ERY'IROI IYCIN' should read --ERY'I'HROMYIN "CLANDINOSYL" should read --CLADINOSYL- line 30, the structural formula OH (CH N 3 should be line 4 4, the structural formula H3 CH3 H H sho 1d b CH3 H line 64, "A" should be --As--. golumn 2, line 49, "of" should be inserted before "460-500". J

SIGNED mu SEALED M 2 4910 M ard M. Flemhu, 1-, mm 1. mm m Auestin Offi missionor 01 Patent; 

